External morphology of eyes and Nebenaugen of caridean decapods–ecological and systematic considerations

Johnson, Magnus L.; Dobson, Nicola; De Grave, Sammy

Abstract

Most caridean decapods have compound eyes of the reflecting superposition kind, and additionally some possess an accessory eye-like organ of unknown function, also referred to as the nebenauge.We examined 308 caridean genera to assess the general morphology of the eye, rostrum length, eye diameter and the presence or absence and, when present, the diameter of the nebenauge.We have attempted to relate these data to ecological and taxonomic considerations.We consider there to be 6 distinct eye types based on the margin between the eyestalk and cornea. The presence of nebenaugen appears to be generally linked to an active lifestyle, as evidenced by the fact that species that have nebenaugen tend to have larger eyes and are more likely to have a distinct rostrum.We suggest that the inconsistencies in its presence/absence under both systematic and ecological lenses may indicate that when present it has various roles relating to behavioural and physiological rhythms.

Citation

Johnson, M. L., Dobson, N., & De Grave, S. (2015). External morphology of eyes and Nebenaugen of caridean decapods–ecological and systematic considerations. PeerJ, 3(8), e1176. https://doi.org/10.7717/peerj.1176

• Acceptance Date: Jul 21, 2015
• Online Publication Date: Aug 18, 2015
• Publication Date: Aug 18, 2015
• Deposit Date: Mar 30, 2016
• Publicly Available Date: Mar 30, 2016
• Journal: PeerJ
• Electronic ISSN: 2167-8359
• Publisher: PeerJ
• Peer Reviewed: Peer Reviewed
• Volume: 3
• Issue: 8
• Pages: e1176
• DOI: https://doi.org/10.7717/peerj.1176
• Keywords: Acessory ocellus; Nebenauge; Eye morphology; Doppleugen; Compound eye; Decapod; Shrimp; Vision
• Public URL: https://hull-repository.worktribe.com/output/434256
• Publisher URL: https://peerj.com/articles/1176/
• Additional Information: Copy of article : Johnson ML, Dobson N, De Grave S. (2015) External morphology of eyes and Nebenaugen of caridean decapods–ecological and systematic considerations. PeerJ 3:e1176 https://doi.org/10.7717/peerj.1176